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Condensed Parent Company Financial Statements - Summary of Cash Flow of Parent Company (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income | $ 18,620 | $ 17,982 | $ 17,493 | $ 16,579 | $ 15,728 | $ 15,630 | $ 18,553 | $ 16,259 | $ 70,674 | $ 66,170 | $ 63,887
Adjustments to reconcile to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Amortization of stock-based compensation arrangements |  |  |  |  |  |  |  |  | 1,636 | 1,717 | 1,676
Other, net |  |  |  |  |  |  |  |  | (5,500) | 6,301 | 5,719
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 90,541 | 78,159 | 76,922
INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net cash and due from banks (paid for) received from acquisitions |  |  |  |  |  |  |  |  |  | (4,007) | 174,283
Net cash used in investing activities |  |  |  |  |  |  |  |  | (98,017) | (265,298) | (183,376)
FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net |  |  |  |  |  |  |  |  | 13,354 | 4,428 | 6,532
Common stock acquired |  |  |  |  |  |  |  |  | (5,523) | (1,654) |
Cash dividends paid |  |  |  |  |  |  |  |  | (22,770) | (21,449) | (19,543)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 259,760 | (128,579) | 162,814
Net increase in cash |  |  |  |  |  |  |  |  | 252,284 | (315,718) | 56,360
Cash, due from banks and interest-bearing deposits at the beginning of the period |  |  |  | 1,598,177 |  |  |  | 1,913,895 | 1,598,177 | 1,913,895 | 1,857,535
Cash, due from banks and interest-bearing deposits at the end of the period | 1,850,461 |  |  |  | 1,598,177 |  |  |  | 1,850,461 | 1,598,177 | 1,913,895
SUPPLEMENTAL DISCLOSURE |  |  |  |  |  |  |  |  |  |  |
Cash paid during the period for interest |  |  |  |  |  |  |  |  | 14,673 | 12,255 | 13,135
Cash received during the period for income taxes, net |  |  |  |  |  |  |  |  | 32,700 | 33,531 | 26,178
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 70,674 | 66,170 | 63,887
Adjustments to reconcile to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | (44,172) | (44,653) | (42,196)
Amortization of stock-based compensation arrangements |  |  |  |  |  |  |  |  | 401 | 1,172 | 1,076
Other, net |  |  |  |  |  |  |  |  | 136 | (343) | (656)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 27,039 | 22,346 | 22,111
INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net cash and due from banks (paid for) received from acquisitions |  |  |  |  |  |  |  |  |  | 5,066 |
Sales and maturities of held for investment and available for sale securities |  |  |  |  |  |  |  |  |  |  | 8
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | 5,066 | 8
FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net |  |  |  |  |  |  |  |  | 13,354 | 4,428 | 6,532
Common stock acquired |  |  |  |  |  |  |  |  | (5,523) | (1,654) |
Cash dividends paid |  |  |  |  |  |  |  |  | (22,770) | (21,449) | (19,543)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (14,939) | (18,675) | (13,011)
Net increase in cash |  |  |  |  |  |  |  |  | 12,100 | 8,737 | 9,108
Cash, due from banks and interest-bearing deposits at the beginning of the period |  |  |  | $ 45,437 |  |  |  | $ 36,700 | 45,437 | 36,700 | 27,592
Cash, due from banks and interest-bearing deposits at the end of the period | $ 57,537 |  |  |  | $ 45,437 |  |  |  | 57,537 | 45,437 | 36,700
SUPPLEMENTAL DISCLOSURE |  |  |  |  |  |  |  |  |  |  |
Cash paid during the period for interest |  |  |  |  |  |  |  |  | 2,096 | 1,998 | 1,965
Cash received during the period for income taxes, net |  |  |  |  |  |  |  |  | $ 5,031 | $ 1,131 | $ 1,822

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